package cn.stylefeng.guns.modular.system.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 *  * @Author Steel.D
 * <p>
 *  * @Description   easypoi导入导出通用工具类
 * <p>
 *  * @Date  2019-7-31 9:29
 * <p>
 *  * @Param
 * <p>
 *  * @return
 * <p>
 *  
 **/

public class EasyPoiUtil {

    /**
     *      * 功能描述：复杂导出Excel，包括文件名以及表名。创建表头
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 9:30
     * <p>
     *      * @param list 导出的实体类
     * <p>
     *      * @param title 表头名称
     * <p>
     *      * @param sheetName sheet表名
     * <p>
     *      * @param pojoClass 映射的实体类
     * <p>
     *      * @param isCreateHeader 是否创建表头
     * <p>
     *      * @param fileName
     * <p>
     *      * @param response
     * <p>
     *      * @return
     * <p>
     *     
     */

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {

        ExportParams exportParams = new ExportParams(title, sheetName);

        exportParams.setCreateHeadRows(isCreateHeader);

        defaultExport(list, pojoClass, fileName, response, exportParams);

    }


    /**
     *      * 功能描述：复杂导出Excel，包括文件名以及表名,不创建表头
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 9:35
     * <p>
     *      * @param list 导出的实体类
     * <p>
     *      * @param title 表头名称
     * <p>
     *      * @param sheetName sheet表名
     * <p>
     *      * @param pojoClass 映射的实体类
     * <p>
     *      * @param fileName  文件名
     * <p>
     *      * @param response
     * <p>
     *      * @return
     * <p>
     *     
     */

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) {

        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));

    }


    /**
     *      * 功能描述：Map 集合导出
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 9:45
     * <p>
     *      * @param list 实体集合
     * <p>
     *      * @param fileName 导出的文件名称
     * <p>
     *      * @param response
     * <p>
     *      * @return
     * <p>
     *     
     */

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {

        defaultExport(list, fileName, response);

    }


    /**
     *      * 功能描述：默认导出方法
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 9:50
     * <p>
     *      * @param list 导出的实体集合
     * <p>
     *      * @param fileName 导出的文件名
     * <p>
     *      * @param pojoClass pojo实体
     * <p>
     *      * @param exportParams ExportParams封装实体
     * <p>
     *      * @param response
     * <p>
     *      * @return
     * <p>
     *     
     */

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {

        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);

        if (workbook != null) {

            downLoadExcel(fileName, response, workbook);

        }

    }

    /**
     *      * 功能描述：Excel导出
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 10:35
     * <p>
     *      * @param fileName 文件名称
     * <p>
     *      * @param response
     * <p>
     *      * @param workbook Excel对象
     * <p>
     *      * @return
     * <p>
     *     
     */

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {

        try {

            response.setCharacterEncoding("UTF-8");

            response.setHeader("content-Type", "application/vnd.ms-excel");

            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

            workbook.write(response.getOutputStream());

        } catch (IOException e) {

            throw new RuntimeException(e);

        }

    }


    /**
     *      * 功能描述：默认导出方法
     * <p>
     *      *
     * <p>
     *      * @author SteeL.D
     * <p>
     *      * @Date 2019-7-31 10:45
     * <p>
     *      * @param list 导出的实体集合
     * <p>
     *      * @param fileName 导出的文件名
     * <p>
     *      * @param response
     * <p>
     *      * @return
     * <p>
     *     
     */

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {

        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);

        if (workbook != null) ;

        downLoadExcel(fileName, response, workbook);

    }


    /**
     *      * 功能描述：根据文件路径来导入Excel
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 11:05
     * <p>
     *      * @param filePath 文件路径
     * <p>
     *      * @param titleRows 表标题的行数
     * <p>
     *      * @param headerRows 表头行数
     * <p>
     *      * @param pojoClass Excel实体类
     * <p>
     *      * @return
     * <p>
     *     
     */

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {

//判断文件是否存在

        if (StringUtils.isBlank(filePath)) {

            return null;

        }

        ImportParams params = new ImportParams();

        params.setTitleRows(titleRows);

        params.setHeadRows(headerRows);

        List<T> list = null;

        try {

            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);

        } catch (NoSuchElementException e) {

            throw new RuntimeException("模板不能为空");

        } catch (Exception e) {

            e.printStackTrace();


        }

        return list;

    }


    /**
     *      * 功能描述：根据接收的Excel文件来导入Excel,并封装成实体类
     * <p>
     *      *
     * <p>
     *      * @author Steel.D
     * <p>
     *      * @Date 2019-7-31 11:30
     * <p>
     *      * @param file 上传的文件
     * <p>
     *      * @param titleRows 表标题的行数
     * <p>
     *      * @param headerRows 表头行数
     * <p>
     *      * @param pojoClass Excel实体类
     * <p>
     *      * @return
     * <p>
     *     
     */

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {

        if (file == null) {

            return null;

        }

        ImportParams params = new ImportParams();

        params.setTitleRows(titleRows);

        params.setHeadRows(headerRows);

        List<T> list = null;

        try {

            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);

        } catch (NoSuchElementException e) {

            throw new RuntimeException("excel文件不能为空");

        } catch (Exception e) {

            throw new RuntimeException(e.getMessage());

        }

        return list;

    }


}
